My wife is returning home to give birth. - Miho, the wife's older sister, came because it would be inconvenient for a man alone. - The man gratefully accepts his sister-in-law's kindness, but... - Miho's true purpose was the dick. - Miho, whose marital relationship is not going well and has fallen into a sexless situation, targets her brother-in-law as a partner to relieve her frustrations. - Miho's temptations one after another are so erotic and sensual that they easily shake the man's thoughts that he cannot betray his wife...